A lamp which is 9.0 cm tall is 269.1 cm in front of a converging lens which has

Question

A lamp which is 9.0 cm tall is 269.1 cm in front of a converging lens which has a focal length of 69.0 cm. What is the image distance for this lamp and lens combination (include sign if negative)? Cm If a screen is placed at the image location found in (a), what will be observed on the screen? a clear, upright, virtual image is visible a clear, inverted, real image is visible a clear, upright, real image is visible a clear, inverted, virtual image is visible no image is visible on the screen If the screen is moved slightly closer to the lens than the distance found in (a), what will be observed on the screen? fuzzy image is visible no image is visible on the screen a clear image slightly smaller than the original image is visible a clear image slightly larger than the original image is visible

Explanation / Answer

a) Here, 1/v + 1/u = 1/f

=> 1/v + 1/269.1 = 1/69

=> v =   92.79 cm

Thus, image distance = 92.79 cm

b) a clear , inverted , real image is visible .

c) a clear image slightly smaller than the original image is visible .

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